gre數學考試關於算術的重點試題(3)

　　考生如果覺得複習gre數學考試比較難不妨從這些題目練習開始，每篇都是按照分類給大家列舉了一些典型題目，本篇主要是針對gre數學考試算術方面的典型題目及答案。下面是21-30題。
　　21. The sum of n different positive integers is less than 100. What is the greatest possible value of n?
　　A.10
　　B.11
　　C.12
　　D.13
　　E.14
　　答案：D
　　22.If p is a prime number greater than 11, and p is the sum of the two prime numbers x and y, then x could be which of the following?
　　A.2
　　B.5
　　C.7
　　D.9
　　E.13
　　答案:A
　　23.Of the positive integers that are multiples of 30 and are less than or equal to 360, what fraction are multiples of 12?
　　A.1/6
　　B.1/5
　　C.1/3
　　D.2/5
　　E.1/2
　　答案:E
　　24.If x, y and z are consecutive integers and x
　　. xyz is even.
　　. x+y+z is even.
　　. is odd.
　　A. None
　　B. only
　　C. only
　　D.andonly
　　E. ,and
　　答案：D
　　25.The product of two consecutive positive integers cannot be
　　A. a prime number
　　B. divisible by 11
　　C. a multiple of 13
　　D. an even number less than 10
　　E. a number having 4 as its units digit.
　　答案：E
　　26.When a certain number is divided by 7, the remainder is 0. If the remainder is not 0 when the number is divided by 14, then the remainder must be
　　A.1
　　B.2
　　C.4
　　D.6
　　E.7
　　答案：E
　　27.How many of the positive integers less than 25 are 2 less than an integer multiple of 4?
　　A.2
　　B.3
　　C.4
　　D.5
　　E.6
　　答案：E
　　28. If y is the average of n consecutive positive integers, n1,what is the sum of the greatest and least of these integers?
　　A. 2y
　　B. ny
　　C. y/2
　　D. y/n
　　E.2n/y
　　答案：A
　　29.A positive integer with exactly two different divisors greater than 1 must be
　　A. a prime
　　B. an even integer
　　C. a multiple of 3
　　D. the square of a prime
　　E. the square of an odd integer
　　答案：D
　　30.What is the least prime number greater than 83?
　　A.85
　　B.87
　　C.88
　　D.89
　　E.91
　　答案：D
　　每到題目都是關於gre數學考試的典型題目，考生可以根據題目來複習知識點，這樣更有針對性。